It is up to you or someone else who has access to the device to be able to add it
having the FCC ID helps a little bit
first steps would be
- open the case and record the chip models, identify the UART pins
- connect to serial console with UART adapter to see if bootloader supports TFTP
- study a commit for a similar board to create a new DTS file and makefile profile
- build an
initramfs-kernel.bin
image to load over TFTP for testing